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#!/usr/bin/python2
"""Extracts V8 version number based on given version.cc file."""
import re
import sys
MAJOR_VERSION_PATTERN = re.compile(r"#define\s+MAJOR_VERSION\s+(.*)")
MINOR_VERSION_PATTERN = re.compile(r"#define\s+MINOR_VERSION\s+(.*)")
BUILD_NUMBER_PATTERN = re.compile(r"#define\s+BUILD_NUMBER\s+(.*)")
PATCH_LEVEL_PATTERN = re.compile(r"#define\s+PATCH_LEVEL\s+(.*)")
patterns = [MAJOR_VERSION_PATTERN,
MINOR_VERSION_PATTERN,
BUILD_NUMBER_PATTERN,
PATCH_LEVEL_PATTERN]
source = open(sys.argv[1]).read()
version_components = []
for pattern in patterns:
version_components.append(pattern.search(source).group(1).strip())
if version_components[len(version_components) - 1] == '0':
version_components.pop()
print '.'.join(version_components)
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